/*
 *                               POK header
 *
 * The following file is a part of the POK project. Any modification should
 * be made according to the POK licence. You CANNOT use this file or a part
 * of a file for your own project.
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2021 POK team
 */

/* @(#)w_exp.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#ifdef POK_NEEDS_LIBMATH

/*
 * wrapper exp(x)
 */

#include "math_private.h"
#include "namespace.h"
#include <libm.h>

#ifdef __weak_alias
__weak_alias(exp, _exp)
#endif

    static const double o_threshold =
        7.09782712893383973096e+02,            /* 0x40862E42, 0xFEFA39EF */
    u_threshold = -7.45133219101941108420e+02; /* 0xc0874910, 0xD52D3051 */

double exp(double x) /* wrapper exp */
{
#ifdef _IEEE_LIBM
  return __ieee754_exp(x);
#else
  double z;
  z = __ieee754_exp(x);
  if (_LIB_VERSION == _IEEE_)
    return z;
  if (finite(x)) {
    if (x > o_threshold)
      return __kernel_standard(x, x, 6); /* exp overflow */
    else if (x < u_threshold)
      return __kernel_standard(x, x, 7); /* exp underflow */
  }
  return z;
#endif
}

#endif
